Table 3 Twin correlation coefficients (95% CIs are shown in brackets) for the primary face looking measures, separate for MZ and DZ pairs

From: Infants’ looking preferences for social versus non-social objects reflect genetic variation

 

N (twin pairs*)

Face orienting

(proportion first look at the face)

Preference for face

(proportion on face)

No. of objects explored

(in 0–10 s)

MZ

155

0.20 [0.03 to 0.34]

0.46 [0.32 to 0.57]

0.05 [−0.12 to 0.22]

DZ

130

0.05 [−0.13 to 0.23]

0.21 [0.01 to 0.38]

0.15 [−0.03 to 0.31]

  1. *Incomplete twin pairs
  2. Correlations were derived from the univariate twin models where means and variances were equated across twin order and zygosity, and age and sex were included as covariates.
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